Lift both your legs off the ground and bring them together, straight up towards the ceiling, keeping them as straight as possible.
Slowly lower your legs to the right side, making a semi-circular motion until they reach the ground.
Lift your legs back up in the same semi-circular motion to the center, then repeat the movement on the left side.
Continue to alternate sides for the desired number of repetitions, making sure to engage your core and keep your lower back pressed into the mat throughout the exercise.